Display device and control method

Abstract

This display device comprises: a communication interface including a display port (DP) interface and configured to communicate with a first external device; a memory for storing at least one instruction; and at least one processor functionally connected to the communication interface and the memory and configured to control the display device. The at least one processor, by executing the at least one instruction, causes the display device to, when an input signal is received from the first external device in a state in which a display power management (DPM) mode of the display device corresponds to a first DPM off mode, change the DPM mode of the display device to a second DPM off mode, identify whether the input signal is a noise signal, and determine whether to change the DPM mode of the display device from the second DPM off mode to a DPM on mode on the basis of whether the input signal is a noise signal.

Description

Display device and control method

[0001] The present disclosure relates to a display device and a control method, and more particularly, to a display device and a control method for switching the mode of an electronic device according to a signal input in a DMP (Display Power Management) off mode.

[0002] When there is no input signal to the display device, power consumption can be reduced by switching to DPM off mode. DPM (Display Power Management) off mode is a mode that shuts down the monitor's high-energy consumption circuitry when the display is not in use to save energy. DPM off mode can also be called standby mode, sleep mode, or power saving mode.

[0003] Previously, when a display device received an input signal in DPM off mode, there was a possibility of malfunction because the display device switched from DPM off mode to DPM on mode even though the input signal was a noise signal.

[0004] That is, in the past, when the input signal was a noise signal, there was a problem of power waste as the display device was switched to the DPM on mode according to the input signal even though the display device should be kept in the DPM off mode.

[0005] Therefore, it is requested to find a way to reduce malfunctions when the display device switches from DPM off mode to DPM on mode.

[0006] The aspects will be set forth in part in the following description, and in part will be obvious from the description or may be learned by practice of the embodiments presented.

[0007] According to one embodiment of the present disclosure, a display device includes a communication interface configured to perform communication with a first external device, the communication interface including a display port (DP) interface; a memory storing at least one instruction; and at least one processor functionally connected to the communication interface and the memory and configured to control the display device, wherein the at least one processor executes the at least one instruction so that, when an input signal is received from the first external device in a state in which a DPM (Display Power Management) mode of the display device corresponds to a first DPM off mode, the display device changes the DPM mode of the display device to a second DPM off mode, identifies whether the input signal is a noise signal, and determines whether to change the DPM mode of the display device from the second DPM off mode to a DPM on mode based on whether the input signal is a noise signal, and the DP interface is activated in a state in which the DPM mode of the display device corresponds to the second DPM off mode.

[0008] In addition, the at least one processor can, by executing the at least one instruction, cause the display device to identify whether the input signal is the noise signal based on information about an address value of the external device included in the input signal and a DPM mode of the external device.

[0009] In addition, the at least one processor can identify the input signal as a noise signal by executing the at least one instruction, if the address value of the external device does not correspond to a previously stored address value or the DPM mode of the external device corresponds to the off mode.

[0010] Additionally, the at least one processor can, by executing the at least one instruction, cause the display device to maintain the DPM mode of the display device in a second DPM off mode if the input signal is a noise signal, and change the DPM mode of the display device to a DPM on mode if the input signal is not a noise signal.

[0011] In addition, the at least one processor can change the DPM mode of the display device from the second DPM off mode to the first DPM off mode when no signal is received from the first external device for a preset period of time while the DPM mode of the display device corresponds to the second DPM off mode by executing the at least one instruction.

[0012] In addition, the communication interface further includes an auxiliary (AUX) pin; and the at least one processor, by executing the at least one instruction, enables the display device to receive a signal including information about a DPM mode of the first external device from the first external device through the AUX pin.

[0013] In addition, the display device is connected to the first external device through the DP interface, and the at least one processor, by executing the at least one instruction, can receive the image signal through an Aux-channel of the DP interface when the display device receives the image signal from the first external device.

[0014] In addition, the communication interface further includes a plurality of interfaces including the DP interface; when the DPM mode of the display device corresponds to the first DPM off mode, the plurality of interfaces are deactivated, and when the DPM mode of the display device corresponds to the DPM on mode, the plurality of interfaces are activated.

[0015] According to one embodiment of the present disclosure, a display device includes a communication interface configured to perform communication with a first external device and a second external device, the communication interface including a display port (DP) interface; a memory storing at least one instruction; and at least one processor functionally connected to the communication interface and the memory and configured to control the display device, wherein the at least one processor executes the at least one instruction such that, when an input signal is received from the first external device in a state in which a DPM (Display Power Management) mode of the display device corresponds to a first DPM off mode, the display device changes the DPM mode of the display device to a second DPM off mode, identifies whether the input signal is a noise signal, determines whether to change the DPM mode of the display device from the second DPM off mode to a DPM on mode based on whether the input signal is a noise signal, determines whether to transmit the input signal to the second external device based on whether the input signal is a noise signal, and, in a state in which the DPM mode of the display device corresponds to the second DPM off mode, the DP interface is activated.

[0016] In addition, the at least one processor can, by executing the at least one instruction, cause the display device to transmit the input signal to the second external device through the communication interface if the input signal is not a noise signal in a state where the DPM mode of the display device corresponds to the DPM on mode.

[0017] Additionally, the at least one processor may, by executing the at least one instruction, cause the display device to not transmit a signal to the second external device when the DPM mode of the display device corresponds to the second DPM off mode and the input signal is not a noise signal.

[0018] According to one embodiment of the present disclosure, a method for controlling a display device includes the steps of: when an input signal is received from a first external device while a DPM (Display Power Management) mode of the display device corresponds to a first DPM off mode, changing the DPM mode of the display device to a second DPM off mode; identifying whether the input signal is a noise signal; determining whether to change the DPM mode of the display device from the second DPM off mode to a DPM on mode based on whether the input signal is a noise signal; and, when the DPM mode of the display device corresponds to the second DPM off mode, a display port (DP) interface included in the communication interface of the display device is activated.

[0019] In addition, the step of identifying whether the input signal is a noise signal may include the step of receiving information about an address value of the first external device and a DPM mode of the first external device; and the step of identifying whether the input signal is the noise signal based on the information about the address value of the first external device and the DPM mode of the first external device.

[0020] In addition, the step of determining whether to change the DPM mode of the display device may include a step of maintaining the DPM mode of the display device in a second DPM off mode if the input signal is a noise signal; and a step of changing the DPM mode of the display device to a DPM on mode if the input signal is not a noise signal.

[0021] According to one embodiment of the present disclosure, a non-transitory computer-readable recording medium storing computer instructions that, when executed by at least one processor of a display device, cause the display device to perform an operation, the operation includes: when a DPM (Display Power Management) mode of the display device corresponds to a first DPM off mode and an input signal is received from the first external device, changing the DPM mode of the display device to a second DPM off mode; identifying whether the input signal is a noise signal; determining whether to switch the DPM mode of the display device from the second DPM off mode to a DPM on mode based on whether the input signal is a noise signal; wherein, when the DPM mode of the display device corresponds to the second DPM off mode, a display port (DP) interface included in the communication interface of the display device is activated.

[0022]

[0023] The above and other aspects, features and advantages of specific embodiments of the present disclosure will become more apparent from the following description taken in conjunction with the accompanying drawings.

[0024] FIG. 1A is a diagram illustrating an embodiment of a display system including a display device according to one embodiment of the present disclosure.

[0025] FIG. 1b is a diagram illustrating an example in which a display device is implemented as a projector according to one embodiment of the present disclosure.

[0026] FIG. 2 is a block diagram showing the configuration of a display device according to one embodiment of the present disclosure.

[0027] FIG. 3 is a drawing for explaining a communication interface among the configurations of a display device according to one embodiment of the present disclosure.

[0028] FIGS. 4 to 8 are drawings for explaining the operation of display devices and external devices connected in a daisy chain manner according to one or more embodiments of the present disclosure.

[0029] FIG. 9 is a flowchart illustrating an example for explaining the operation of a display device according to an input signal, according to one embodiment of the present disclosure.

[0030] FIGS. 10 to 16 are sequence diagrams illustrating the operation of a display device and at least one external device connected in a daisy chain manner according to one or more embodiments of the present disclosure.

[0031] FIG. 17 is a flowchart for explaining a method for controlling a display device according to an input signal, according to one embodiment of the present disclosure.

[0032] Hereinafter, various embodiments of the present invention will be described with reference to the attached drawings. It should be understood that the contents described herein are not intended to limit the scope of the present invention to specific embodiments, but rather include various modifications, equivalents, and / or alternatives of the embodiments. In connection with the description of the drawings, the same or similar reference numerals may be used for similar components.

[0033] Additionally, the terms "first," "second," and the like used herein are used to distinguish various components from each other, regardless of order or importance. Therefore, these terms do not limit the order or importance of the components. For example, the first component could be renamed the second component, and similarly, the second component could be renamed the first component, without departing from the scope of the rights set forth in this document.

[0034] Additionally, when it is stated herein that one component (e.g., a first component) is operatively or communicatively coupled or connected to another component (e.g., a second component), it should be understood that this includes all cases where the components are directly connected or indirectly connected through another component (e.g., a third component). Conversely, when it is stated that a component (e.g., a first component) is "directly coupled" or "directly connected" to another component (e.g., a second component), it can be understood that no other component (e.g., a third component) exists between the component and the other component.

[0035] The terms used in this disclosure are used to describe certain embodiments and may not be intended to limit the scope of other embodiments. In addition, although singular expressions may be used in this disclosure for convenience of explanation, this may be interpreted to include plural expressions unless the context clearly indicates otherwise. In addition, the terms used in this disclosure may have the same meaning as generally understood by a person of ordinary skill in the relevant technical field. Among the terms used in this disclosure, terms defined in general dictionaries may be interpreted as having the same or similar meaning in the context of the related technology, and shall not be interpreted in an idealized or overly formal meaning unless explicitly defined in this disclosure. In some cases, even if a term is defined in this disclosure, it cannot be interpreted to exclude the embodiments of this disclosure.

[0036] Hereinafter, various embodiments of the present invention will be described in detail using the attached drawings.

[0037] FIG. 1A and FIG. 1B are diagrams illustrating an embodiment of a display system including a display device. The display system may include an external source device (200), a first external device (300), a display device (100), and a second external device (400). Here, the external source device (200), the first external device (300), the display device (100), and the second external device (400) may be connected in a daisy chain manner. When connected in a daisy chain manner, it means when a plurality of electronic devices are connected in series. Specifically, when the external source device (200) and the first external device (300) are connected in series, the first external device (300) is connected in series with the display device (100), and the display device (100) and the second external device (400) are connected in series, it means when connected in a daisy chain manner.

[0038] Additionally, in order for multiple display devices to be connected in a daisy chain manner, the multiple display devices may be of the same type. The term "same type of display devices" may refer to cases where the specifications of the display devices are identical. For example, if the specifications of the first external device (300) and the specifications of the display device (100) are identical, each display device may be considered the same display device. However, this is merely an example, and the multiple display devices may be of different types.

[0039] The display device (100) is a device for displaying an image, and may include, but is not limited to, a television, a computer monitor, or digital signage. In particular, the display device (100) may be a display device used at home or school, at industrial sites such as factories, or at medical institutions. In addition, the display device (100) may be used for various purposes and uses, such as watching broadcasts, playing images such as games or movies, controlling and monitoring traffic, and displaying disaster prevention or advertising images. In addition, the display device (100) may display one image together with other external devices (for example, the first external device (300) and the second external device (400)), but this is only one embodiment, and the display device (100) and other external devices may each display multiple images.

[0040] In addition, for the convenience of explanation, as illustrated in FIG. 1A, not only the display device (100), but also the external source device (200), the first external device (300), and the second external device (400) will be assumed to be display devices and described below. However, the display device (100), the external source device (200), the first external device (300), and the second external device (400) are not limited to display devices.

[0041] In detail, the external source device (200) is illustrated as a display device in FIGS. 1A and 1B, but this is only an example and is not limited to a display device. That is, the external source device (200) may be implemented as not only a display device, but also a notebook PC, a tablet PC, a notebook PC, or a monitor.

[0042] According to one embodiment of the present disclosure, the display device (100) can operate in a first DPM (Display Power Management) off mode while no input signal is received from the outside. When an input signal is received from a first external device (300) while operating in the first DPM off mode, the display device (100) can determine whether the received input signal is a normal signal (or a wake-up signal) or a noise signal. In particular, when an input signal is received from the first external device (300) while operating in the first DPM off mode, the display device (100) can switch to a second DPM off mode regardless of the type of the input signal.

[0043] Here, the first DPM off mode refers to a mode in which power is supplied only to the minimum essential components for display operation standby (e.g., IR receiver, etc.) and power supply is cut off or reduced to other components, especially components such as heaters and biasing ICs (Integrated Circuits) that consume high power. In other words, the first DPM off mode may refer to a conventional DPM off mode. The second DPM off mode may refer to a mode in which a DP (Display Port) interface is activated in the first DPM off mode. At this time, the second DPM off mode may be called by various terms such as fake DPM off mode, reserve DPM off mode, etc.

[0044] The display device (100) can determine whether the input signal is a normal signal or a noise signal during the second DPM off mode. Furthermore, the display device (100) can either maintain the second DPM off mode or switch to the DPM on mode based on the determination result. The detailed operation of the present invention will be described in detail later.

[0045] As illustrated in FIG. 1a, multiple display devices (200, 300, 100, 400) are connected in a daisy chain manner, and thus a state of being connected via a wired cable is illustrated, but this is only one example, and it is also possible for multiple display devices to be connected via a wireless communication interface.

[0046] In FIG. 1a, the electronic device (100) is described as a display device, but this is only one example, and the electronic device (100) may be implemented as a projector as shown in FIG. 1b.

[0047] That is, as illustrated in FIG. 1B, the external source device (200), the first external device (300), the projector (100), and the second external device (400) can be connected in a daisy chain manner. Specifically, if the electronic device (100) implemented as a projector has the same specifications as the first external device (300) and the second external device (400), or if the electronic device (100) implemented as a projector supports the same interface (e.g., DisplayPort) as the first external device (300) and the second external device (400), they can be connected in a daisy chain manner.

[0048] If the electronic device (100) is implemented as a projector, the projector may include a display portion. Specifically, the projector may be implemented as a projector including a built-in display.

[0049] For example, if the projector is connected to a first external device (300), it may receive an input signal from the first external device (300) and project an image through the built-in display.

[0050] FIG. 2 is a block diagram illustrating a configuration of a display device according to at least one embodiment of the present disclosure.

[0051] As illustrated in FIG. 2, the display device (100) may include a communication interface (110), a power supply (120), a memory (130), a display (140), and a processor (150). Meanwhile, the configuration of the display device (100) illustrated in FIG. 1A is merely an example, and it is to be understood that the configuration may be added or deleted depending on the type of the display device (100).

[0052] A display device (100) according to one embodiment of the present disclosure may be implemented as a user terminal such as a notebook PC, a smart phone, a tablet PC, a notebook PC, a TV, etc., and may be implemented as various devices such as home appliances, IoT devices, etc.

[0053] The communication interface (110) includes at least one circuit and can communicate with various types of external devices or servers.

[0054] In particular, the communication interface (110) includes a Display Port interface (hereinafter referred to as a DP interface), and the display device (100) and at least one external device (300, 400) can be connected through the DP interface. For example, the DP interface can include a DP RX (DisplayPort Receiver) and a DP TX (DisplayPort Transmitter). The display device (100) can receive or transmit signals to or from the first external device (300) and the second external device (400) through the DP RX and the DP TX. For example, the display device (100) can receive an input signal from the first external device (300) through the DP RX (DisplayPort Receiver). A repeater IC among the integrated circuits of the display device (100) can transmit the received signal to the second external device (400) connected to the display device (100) through the DP TX (DisplayPort Transmitter).

[0055] However, the above description is merely an example, and the communication interface (110) may include various communication interfaces, such as a BLE (Bluetooth Low Energy) interface, a Wi-Fi communication interface, a cellular communication interface, a 3G (third generation) mobile communication interface, a 4G (fourth generation) mobile communication interface, a 4th generation LTE (Long Term Evolution) communication interface, a 5G (fifth generation) mobile communication interface, etc., in addition to the DP interface.

[0056] Alternatively, the communication interface (110) may include a wired communication interface for inputting and outputting at least one of an audio signal and a video signal. For example, the communication interface (110) may be an HDMI (High Definition Multimedia Interface), but this is only one embodiment, and may be any one of an MHL (Mobile High-Definition Link), a USB (Universal Serial Bus), a Thunderbolt, a VGA (Video Graphics Array) port, an RGB port, a D-SUB (D-subminiature), and a DVI (Digital Visual Interface). Depending on the implementation example, the communication interface (110) may include a port that inputs and outputs only an audio signal and a port that inputs and outputs only a video signal as separate ports, or may be implemented as a single port that inputs and outputs both an audio signal and a video signal.

[0057] FIG. 3 is a diagram illustrating a communication interface among the components of a display device according to an embodiment of the present disclosure. The communication interface (110) may include a receiver (111) and a transmitter (112). The communication interface (110) may receive information about other devices (e.g., identification information of an external electronic device or information about a DPM status, etc.) through the receiver (111), and may transmit at least one of a control signal, an audio signal, and a video signal to the other electronic device through the transmitter (112).

[0058] Referring to FIG. 3, the physical interface may include a physical interface corresponding to various types of interface technologies, such as a wireless communication module (1111, 1121), a display port (1112, 1122, DP), a high-definition multimedia interface (1113, 1123, HDMI), a digital visual interactive (1114, 1124, DVI), or a single display interface (UDI).

[0059] Here, the wireless communication module (1111, 1121) means a communication module capable of performing one or more mobile communication technologies or short-range communication technologies, and the wireless communication module may include one or more communication chips and one or more antennas.

[0060] Among the physical interfaces, DP (Display Port, 1112, 1122) is a digital interface standard for transmitting video and audio signals between display devices. Display Port is a standard developed by VESA (Video Electronics Standards Association) and can support high-resolution digital displays. The display device (100) and the first external device (300) are connected via Display Port (DP) to transmit video and audio signals between the display devices or information about the DPM mode of the display device.

[0061] A high-resolution multimedia interface (1113, 1123, HDMI) is an interface capable of simultaneously transmitting digital video and audio signals. HDMI can transmit high-resolution video and high-quality audio with a single cable. An electronic device (100) can receive various videos or audios through a first external device (300) and the high-resolution multimedia interface (1113, 1123, HDMI), and the electronic device (100) can transmit various videos or audios to a second external device (400) through the high-resolution multimedia interface (1113, 1123, HDMI).

[0062] Digital Visual Interactive (DVI) (1114, 1124) is a video interface standard used to connect computers and display devices. DVI (1114, 1124) supports both digital and analog signals and can be used to transmit high-resolution video digitally. An electronic device (100) is connected to a first external device (300) or a second external device (400) via Digital Visual Interactive (1114, 1124) and can receive or transmit digital and analog signals.

[0063] The wired communication module (1115, 1125) may be a module that communicates with an external device via a wire. For example, the wired communication module (1115, 1125) may include at least one of a LAN (Local Area Network) module, an Ethernet module, a pair cable, a coaxial cable, a fiber optic cable, or a UWB (Ultra Wide-Band) module.

[0064] Although the description is based on the receiver (111) and transmitter (112) of the display device, this can be similarly applied to the receiver (111) and transmitter (112) of the display device in the case of the wireless communication module (3111), DP (3112), HDMI (3113), DVI (3114), and wired communication module (3115) included in the receiver (311) of the first external device (300), and the wireless communication module (3121), DP (3122), HDMI (3123), DVI (3124), and wired communication module (3125) included in the transmitter (312) of the first external device (300).

[0065] The power supply unit (120) can switch the display device from a power saving state (DPM off mode) to a DPM on state. DPM (Display Power Management) refers to a standard for managing the power supply of display devices such as video monitors. According to DPM (Display Power Management), the display device (100) can be in a DPM (Display Power Management) on state and a DPM (Display Power Management) off state. The power usage level and recovery time may be different for each state. Meanwhile, the DPM off mode (or DPM off state) may be called a standby mode, a sleep mode, a power saving mode, etc., and the DPM on mode (or DPM on state) may be called a general mode, a normal mode, etc.

[0066] The memory (130) can store an operating system (OS) for controlling the overall operation of components of the display device (100) and instructions or data related to components of the display device (100).

[0067] The memory (130) may be implemented in various forms, such as volatile memory (e.g., dynamic RAM (DRAM), static RAM (SRAM), or synchronous dynamic RAM (SDRAM)), non-volatile memory (e.g., one time programmable ROM (OTPROM), programmable ROM (PROM), erasable and programmable ROM (EPROM), electrically erasable and programmable ROM (EEPROM), mask ROM, flash ROM, flash memory (e.g., NAND flash or NOR flash), hard drive, or solid state drive (SSD)).

[0068] The display (140) can display various information. The display device (100) can operate in DPM on mode or DPM off mode. When the display device (100) is in DPM on mode, the display (140) can display various information. However, when the mode of the display device (100) is DPM off mode, the display (140) can display a single-color screen (e.g., a black screen), i.e., a screen when the display is in power saving mode.

[0069] In addition, the display (140) may be implemented as an LCD (Liquid Crystal Display Panel), OLED (Organic Light Emitting Diodes), etc., but is not limited thereto. In addition, the display may also be implemented as a flexible display, a transparent display, etc.

[0070] The processor (150) may include one or more processors. Specifically, the one or more processors may include one or more of a Central Processing Unit (CPU), a Graphics Processing Unit (GPU), an Accelerated Processing Unit (APU), a Many Integrated Core (MIC), a Digital Signal Processor (DSP), a Neural Processing Unit (NPU), a hardware accelerator, or a machine learning accelerator. The processor (150) may control one or any combination of other components of the electronic device, and may perform operations related to communication or data processing. The one or more processors may execute one or more programs or instructions stored in a memory. For example, the one or more processors may perform a method according to an embodiment of the present disclosure by executing one or more instructions stored in a memory.

[0071] One or more processors may be implemented as a single core processor including one core, or may be implemented as one or more multicore processors including multiple cores (e.g., homogeneous multicores or heterogeneous multicores). When one or more processors are implemented as a multicore processor, each of the multiple cores included in the multicore processor may include internal processor memory, such as cache memory or on-chip memory, and a common cache shared by the multiple cores may be included in the multicore processor. In addition, each of the multiple cores (or some of the multiple cores) included in the multicore processor may independently read and execute a program instruction for implementing a method according to an embodiment of the present disclosure, or all (or some) of the multiple cores may be linked to read and execute a program instruction for implementing a method according to an embodiment of the present disclosure.

[0072] In particular, the processor (150) can operate the display device (100) in a first DPM (Display Power Management) off mode by executing at least one instruction stored in the memory (130). When an input signal is received from the first external device (300), the processor (150) can switch the mode of the display device (100) to a second DPM off mode. The processor (150) identifies whether the input signal is a noise signal. Based on the identification result, the processor (150) can determine whether to switch the second DPM off mode to the DPM on mode.

[0073] Hereinafter, the operation of the display device (100) controlled by the processor (150) will be described in more detail with reference to FIGS. 4 to 8.

[0074] First, as illustrated in FIG. 4, the external source device (200), the first external device (300), and the display device (100) may be connected in a daisy chain manner. When connected in a daisy chain manner, this means that the external source device (200) and the first external device (300) are connected, and the first external device (300) and the display device (100) are connected continuously. Here, the first external device (300) can receive a signal from the external source device (200), and the first external device (300) can continuously transmit the received signal to the electronic device (100).

[0075] Although the devices of the external source device (200), the first external device (300), and the display device (100) are illustrated in FIGS. 4 to 7, this is merely an example, and four or more electronic devices can be connected in a daisy chain manner to transmit signals.

[0076] As illustrated in FIG. 4, when the external source device (200) or the first external device (300) is in the first DPM off mode (e.g., DPMS (Display Power Management State)), the display device (100) may also operate in the first DPM off mode. That is, the display device (100) may be maintained in the first DPM off mode when no input signal is transmitted from the first external device (300). Here, when in the first DPM off mode, multiple communication interfaces of the display device (100) may be deactivated.

[0077] When an input signal is received by the display device (100), the display device (100) may be switched to a second DPM mode (e.g., FAKE DPMS) as illustrated in FIG. 5. The second DPM off mode refers to a mode in which the display device (100) activates the DP interface in the first DPM off mode. That is, when the display device (100) is switched from the first DPM off mode to the second DPM off mode, the DP interface among the communication interfaces (110) of the display device (100) may be activated. Accordingly, the display device (100) may receive information from the first external device (300) through an AUX channel (auxiliary channel) among the DP interfaces.

[0078] Here, the AUX channel among the DP interfaces is a half-duplex bidirectional channel used for link management and device control. When the AUX channel is activated, the display device (100) can analyze the status and DPCD (Display Port Configuration Data) of an external device connected to the AUX channel. In one embodiment, the status of the external device may mean information such as the DPM mode of the external device. When the AUX channel among the DP interfaces is activated, the display device (100) can obtain information on whether the external device is in the first DPM off mode, the second DPM off mode, or the DPM on mode.

[0079] In addition, through the AUX pin, the display device (100) can obtain information about DPCD (Display Port Configuration Data). DPCD (Display Port Configuration Data) refers to information about an external device for communication through a DP interface among communication interfaces. In this case, information about the external device may refer to identification information of the external device (e.g., specification information, product name, address value, etc.) and information about the DPM mode of the external device.

[0080] When the display device (100) is switched to the second DPM off mode, the display device (100) can determine whether a signal received from the first external device (300) is a noise signal, as illustrated in FIG. 6. The display device (100) can identify whether the input signal is a noise signal based on information about the address value of the external device included in the input signal and the DPM mode of the external device. Specifically, the display device (100) can identify the input signal as a noise signal if the address value of the external device does not match a pre-stored address value corresponding to the first external device (300) or if it is determined that the DPM mode of the external device is off.

[0081] In one embodiment, the communication interface (110) of the display device (100) may include an AUX pin (111a). In this case, the display device (100) may receive a signal including information about the DPM mode of the first external device (300) from the first external device (300) through the AUX pin (111a).

[0082] The display device (100) can use information about the address value of the external device and information about the DPM mode of the external device to determine whether the signal received from the first external device (300) is a noise signal. For example, if, among the information included in the signal received by the display device (100), the information about the address value of the first external device (300) and the information about the address value of the external device do not match, or if the information about the DPM mode of the first external device is determined to be the first DPM off mode or the second DPM off mode, the display device (100) can determine that the received signal is a noise signal.

[0083] In addition, if the signal received by the display device (100) from the first external device (300) matches the information about the address value of the first external device (300) and the information about the address value of the preset external device, and the DPM mode of the first external device is the DPM on mode, the display device (100) can determine that the input signal is a signal that is not a noise signal (e.g., a WAKE-UP signal). At this time, if the display device (100) is in the first DPM off mode or the second DPM off mode, it can switch to the DPM on mode. If the input signal received when the display device (100) is in the DPM on mode is a signal that is not a noise signal, the DPM on mode can be maintained.

[0084] When the display device (100) is in the second DPM off mode, the display device (100) can obtain information about the address value and mode of the external device from a specific address through an AUX channel. After obtaining information about the specific address value, the display device (100) can obtain information about the specifications of the external device from the specific address value. Information about the specifications may refer to the characteristics of the external device.

[0085] As illustrated in FIG. 7, the display device (100) remains in the second DPM off mode if the input signal corresponds to a noise signal. In this case, after a preset time (e.g., 60 seconds) has elapsed, the display device (100) can switch back to the first DPM off mode, as illustrated in FIG. 4.

[0086] The display device (100) can determine that the received signal is not a noise signal. In this case, as illustrated in FIG. 8, the display device (100) can be controlled to switch to the DPM on mode. When in the DPM on mode, all communication interfaces of the display device (100) can be activated.

[0087]

[0088] FIG. 9 is a flowchart for explaining the operation of a display device according to a received signal, according to one embodiment of the present disclosure.

[0089] The display device (100) may operate in the first DPM off mode (S910). At this time, this may mean that the communication interface (110) of the display device (100) is in an inactive state.

[0090] At this time, when an input signal is received from the first external device (300), the display device (100) can switch to the second DPM off mode (S920). The display device (100) can switch to the second DPM off mode regardless of whether the input signal is a noise signal.

[0091] The display device (100) can determine whether the received input signal is noise (S930). The display device (100) can determine whether the input signal is noise based on the address value of the external device and information about the DPM on / off mode of the external device among the information contained in the received input signal received through the DP interface during the second DPM off mode.

[0092] The display device (100) may maintain the second DPM off mode if the received input signal corresponds to noise (S940). If the display device (100) is in the second DPM off mode, if there is no input signal from the first external device for a preset period of time, the display device (100) may switch to the first DPM off mode (S950). To reduce power consumption, the display device (100) may switch from the second DPM off mode to the first DPM off mode if no additional input signal is received from the first external device for a preset period of time (e.g., 60 seconds).

[0093] However, the display device (100) can switch to the DPM on mode if the received input signal does not correspond to noise (S960). That is, if the information included in the input signal received by the display device (100) matches the address value of the external device with the address value preset by the display device (100) and the DPM state of the first external device corresponds to the DPM on mode, the display device (100) can determine that the received input signal does not correspond to a noise signal. In this case, the display device (100) can switch from the second DPM off mode to the DPM on mode.

[0094] Meanwhile, in the above-described embodiment, the display system is described as including an external source device (200), a first external device (300), and a display device (100). However, this is merely one embodiment, and the display system may be implemented in a different type of daisy chain manner. This will be described with reference to FIGS. 10 to 16.

[0095] FIG. 10 is a sequence diagram for explaining the operation of a first external device (300) and a display device (100) when the display device (100) and the first external device (300) are connected in a daisy chain manner according to one embodiment of the present disclosure. In this case, the first external device (300) may be an external source device.

[0096] The display device (100) may be in the first DPM off mode (S1010).

[0097] The first external device (300) can transmit a signal to the display device (100) (S1020).

[0098] When the display device (100) receives an input signal from the first external device (300), it can switch to the second DPM off mode (S1030).

[0099] The display device (100) can determine whether a signal received during the second DPM off mode is noise (S1040). Specifically, the display device (100) can determine whether the received signal is noise based on the address value of the first external device (300) included in the received signal and information about the DPM mode of the first external device (300).

[0100] The display device (100) may maintain the second DPM off mode if the received signal is noise (S1050). That is, if the signal received by the display device (100) does not correspond to a wake-up signal, the display device (100) may maintain the second DPM off mode to save power. However, if a preset time has passed, the display device (100) may switch from the second DPM off mode to the first DPM off mode.

[0101] FIG. 11 is a sequence diagram for explaining the operation of the first external device (300) and the display device (100) when the display device (100) and the first external device (300) are connected in a daisy chain manner according to one embodiment of the present disclosure. Meanwhile, steps S1110 to S1140 of FIG. 11 have the same description as steps S1010 to S1040 of FIG. 10, and thus, overlapping descriptions will be omitted.

[0102] That is, the display device (100) can switch to the DPM on mode if the received signal is not noise (S1150). Specifically, if the address value of the external device included in the input signal matches the address value of the first external device (300) and the mode of the first external device (300) is the DPM on mode, the display device (100) can determine that the input signal is not noise and switch to the DPM on mode.

[0103]

[0104] FIG. 12 is a sequence diagram illustrating the operation of a display device and at least one external device connected in a daisy chain manner according to various embodiments of the present disclosure.

[0105] The external source device (200) may be in the first DPM off mode (S1210). At this time, since the external source device (200) corresponds to the first DPM off mode, it does not transmit a signal to the first external device (300). The first external device (300) may also be maintained in the first DPM off mode. (S1220) Even though the first external device (300) is in the first DPM off mode, a signal may be transmitted to the display device (100) (S1221). At this time, the display device (100) may be maintained in the first DPM off mode (S1230). When the display device (100) receives an input signal from the first external device (300), the display device (100) may be switched to the second DPM off mode (S1231). The display device (100) switches to the second DPM off mode, activates the Display Port (DP) interface among the communication interfaces, and can receive a signal from the first external device (300) through the AUX channel. At this time, the display device (100) can determine whether the received signal is noise (S1232). Even if the address value of the first external device (300) included in the input signal received from the first external device (300) matches the previously stored address value, since the external source device (200) corresponds to the first DPM off mode, the display device (100) can determine that the received signal is noise. At this time, the display device (100) can determine the DPM mode of the external source device and the first external device. That is, if the DPM modes of both the external source device (200) and the first external device (300) are the DPM on mode, it can be determined that "the DPM mode of the external device is the DPM on mode."Specifically, as illustrated in FIG. 12, not only when the DPM modes of both the external source device (200) and the first external device (300) are in the DPM off mode, but also as illustrated in FIG. 13, when one of the modes of the external source device (200) or the first external device (300) is in the DPM off mode, the DPM status mode can be determined as the “DPM off mode” when determining noise.

[0106] If it is determined that the received signal is noise (S1232), the display device (100) can maintain the second DPM off mode if the received input signal is noise (S1233). If the display device (100) is in the second DPM off mode, when a preset time has elapsed, the display device (100) can switch from the second DPM off mode to the first DPM off mode.

[0107] FIG. 13 is a sequence diagram illustrating the operation of a display device and at least one external device connected in a daisy chain manner according to various embodiments of the present disclosure.

[0108] Meanwhile, steps S1310 to S1332 of FIG. 13 have the same description as steps S1210 to S1232 of FIG. 12, so overlapping descriptions will be omitted.

[0109] The display device (100) can maintain the second DPM off mode after determining whether the received signal is noise (S1332), and if the received signal is determined to be a noise signal (S1333).

[0110] Specifically, the display device (100) can determine that the address value of the external device included in the received input signal does not match the address value of the first external device (300), the mode of the external source device (200) is the DPM off mode, or the mode of the first external device (300) is the DPM off mode, and maintain the second DPM off mode by determining it as a noise signal.

[0111] FIG. 14 is a sequence diagram illustrating the operation of a display device and at least one external device connected in a daisy chain manner according to various embodiments of the present disclosure.

[0112] Unlike FIGS. 12 and 13, the display device (100) can receive a signal that is not noise from the first external device. As illustrated in FIG. 14, the external source device (200) can be in DPM on mode (S1410). The external source device (200) can transmit a signal to the first external device (300) (S1411). When the first external device (300) receives an input signal from the external source device (200), it can switch to the second DPM off mode (S1420). The first external device (300) can determine whether the received signal is noise (S1421). Since the determination of whether the input signal corresponds to noise has been described above, it is omitted. When the received input signal is not noise, the first external device (300) can switch from the second DPM off mode to the DPM on mode (S1422). The display device (100) may be maintained in the first DPM off mode when it does not receive a signal from the external source device (200) and the first external device (S1430). The display device (100) may transmit a signal from the first external device (S1423). The display device (100) may receive an input signal and switch to the second DPM off mode (S14310). The display device (100) may determine whether the received signal is noise (S1432). If the received signal is not noise, the display device (100) may switch from the second DPM off mode to the DPM on mode (S1433).

[0113]

[0114] FIG. 15 and FIG. 16 are sequence diagrams for explaining the operation of a display device and at least one external device connected in a daisy chain manner according to various embodiments of the present disclosure.

[0115] As illustrated in FIG. 15, when the external source device (200) is in the first DPM off mode (S1510), a signal can be transmitted to the first external device (300) (S1511). At this time, the first external device (300) can receive a signal from the first external device (300) in the first DPM off mode (S1520) and switch to the second DPM off mode (S1521).

[0116] The display device (100) may also be switched to the second DPM off mode (S1532) when a signal is received from the first external device (300) while being maintained in the first DPM off mode (S1530). At this time, the display device (100) may determine whether the signal received is noise (S1533), and if it is determined to be a noise signal, the display device (100) may be maintained in the second DPM off mode (S1534).

[0117] When the display device (100) is connected to transmit a video signal to a second external device (400), the display device (100) may not transmit a signal to the second external device (400) because it corresponds to the second DPM off mode. In this case, since the second external device (400) has not received a signal, it may be maintained in the first DPM off mode (S1540).

[0118]

[0119] As shown in Fig. 16, when the external source device (200) is in DPM on mode, the display is switched to DPM on mode and the second external device (400) connected in a daisy chain manner can also be switched to DPM on mode.

[0120] First, the external source device (200) can operate in DPM on mode (S1610). The external source device (200) can transmit a signal to the first external device (300) (S1611). If the first external device (300) is set to the first DPM off mode or the second DPM off mode, the first external device (300) can receive the signal and switch to the DPM on mode (S1620). The first external device (300) can transmit a signal to the display device (100) (S1621). The display device (100) may be set to the first DPM off mode (S1630). The display device (100) can receive an input signal from the first external device (300) (S1621) and determine whether the received signal is noise (S16310). If the received input signal is not noise, the first DPM off mode can be switched to the DPM on mode (S1632). At this time, when the display device (100) is connected to transmit a video signal to the second external device (400), and the input signal is determined not to be a noise signal, and the display device (100) is switched to the DPM on mode (S1632), an AUX signal can be transmitted to the second external device (400) through the communication interface (110) (S1633).

[0121] The display device (100) can transmit a signal to a second external device (400) via a repeater IC through a communication interface. The second external device (400) can receive the signal and, if it determines that the received signal is not a noise signal, switch to the DPM on mode (S1640).

[0122] FIG. 17 is a flowchart illustrating a method for controlling a display device according to an embodiment of the present disclosure. The display device may operate in a first DPM off mode (S1710). When an input signal is received from a first external device, the display device may switch the mode of the display device to a second DPM off mode (S1720). After switching to the second DPM off mode, the display device may identify whether the received input signal is a noise signal (S1730). The display device may determine whether to switch the second DPM off mode to a DPM on mode based on the identification result (S1740). The display device may determine whether the input signal is a noise signal based on information about the address value of the external device included in the received input signal and information about the DPM status of the external device. If the display device determines that the input signal corresponds to a noise signal, the display device may maintain the second DPM off mode, and if it determines that the input signal does not correspond to a noise signal, the display device may switch to the DPM on mode.

[0123] As in the present disclosure, when the display device (100) receives an input signal, rather than switching to the DPM on mode, it switches to the second DPM off mode and then goes through a process of determining whether the input signal is a noise signal, thereby reducing the problem of power waste as in the past.

[0124] In addition, the methods according to various embodiments of the present disclosure may be provided as included in a computer program product. The computer program product may be traded as a commodity between a seller and a buyer. The computer program product may be distributed in the form of a machine-readable storage medium (e.g., compact disc read only memory (CD-ROM)), or may be distributed online (e.g., downloaded or uploaded) through an application store (e.g., Play Store™) or directly between two user (20) devices (e.g., smartphones). In the case of online distribution, at least a portion of the computer program product (e.g., downloadable app) may be temporarily stored or temporarily generated in a machine-readable storage medium, such as the memory of a manufacturer's server, an application store's server, or a relay server.

[0125] The methods according to various embodiments of the present disclosure may be implemented as software including commands stored in a machine-readable storage medium that can be read by a machine (e.g., a computer). The device is a device that can call commands stored from the storage medium and operate according to the called commands, and may include a server device or an electronic device according to the disclosed embodiments.

[0126] Meanwhile, a device-readable storage medium may be provided in the form of a non-transitory readable recording medium. Here, the term "non-transitory readable recording medium" simply means a tangible device that does not contain signals (e.g., electromagnetic waves). This term does not distinguish between cases where data is stored semi-permanently in the storage medium and cases where data is stored temporarily. For example, a "non-transitory storage medium" may include a buffer in which data is temporarily stored.

[0127] When the above instruction is executed by the processor, the processor may perform the function corresponding to the instruction directly or by using other components under the control of the processor. The instruction may include code generated or executed by a compiler or interpreter.

[0128] The embodiments described above are merely examples intended to illustrate the technical content of embodiments of the present invention and aid understanding of the embodiments of the present invention, and are not intended to limit the scope of the embodiments of the present invention. Therefore, the scope of the various embodiments of the present disclosure should be interpreted to include the embodiments disclosed in the present disclosure, along with all modifications or variations derived based on the technical spirit of the present disclosure.

Claims

1. In the display device, A communication interface including a display port (DP) interface and configured to communicate with a first external device; memory that stores at least one instruction; and At least one processor functionally connected to the communication interface and the memory and configured to control the display device; The at least one processor, by executing the at least one instruction, causes the display device to: When an input signal is received from the first external device while the DPM (Display Power Management) mode of the display device corresponds to the first DPM off mode, the DPM mode of the display device is changed to the second DPM off mode, Identify whether the above input signal is a noise signal, Determine whether to change the DPM mode of the display device from the second DPM off mode to the DPM on mode based on whether the input signal is a noise signal; A display device in which the DP interface is activated when the DPM mode of the display device corresponds to the second DPM off mode.

2. In paragraph 1, The at least one processor, by executing the at least one instruction, causes the display device to: A display device that identifies whether the input signal is the noise signal based on the address value of the external device included in the input signal and information about the DPM mode of the external device.

3. In paragraph 2, The at least one processor, by executing the at least one instruction, causes the display device to: A display device that identifies the input signal as a noise signal when the address value of the external device does not correspond to a previously stored address value or the DPM mode of the external device corresponds to the off mode.

4. In paragraph 1, The at least one processor, by executing the at least one instruction, causes the display device to: If the above input signal is a noise signal, the DPM mode of the display device is maintained as the second DPM off mode, A display device that changes the DPM mode of the display device to the DPM on mode when the above input signal is not a noise signal.

5. In paragraph 1, The at least one processor, by executing the at least one instruction, causes the display device to: If no signal is received from the first external device for a preset period of time while the DPM mode of the display device corresponds to the second DPM off mode, A display device that changes the DPM mode of the display device from the second DPM off mode to the first DPM off mode.

6. In paragraph 1, The above communication interface is, Includes an additional auxiliary (AUX) pin; The at least one processor, by executing the at least one instruction, causes the display device to: A display device that receives a signal containing information about the DPM mode of the first external device from the first external device through the AUX pin.

7. In paragraph 1, The display device is connected to the first external device via the DP interface, The at least one processor, by executing the at least one instruction, causes the display device to: A display device that receives a video signal from the first external device through an Aux-channel of the DP interface.

8. In paragraph 1, The above communication interface is, Further comprising a plurality of interfaces including the above DP interface; When the DPM mode of the above display device corresponds to the first DPM off mode, the plurality of interfaces are deactivated, A display device in which the plurality of interfaces are activated when the DPM mode of the display device corresponds to the DPM on mode.

9. In the display device, A communication interface including a display port (DP) interface and configured to communicate with a first external device and a second external device; memory that stores at least one instruction; and At least one processor functionally connected to the communication interface and the memory and configured to control the display device; The at least one processor, by executing the at least one instruction, causes the display device to: When an input signal is received from the first external device while the DPM (Display Power Management) mode of the display device corresponds to the first DPM off mode, the DPM mode of the display device is changed to the second DPM off mode, Identify whether the above input signal is a noise signal, It is determined whether to change the DPM mode of the display device from the second DPM off mode to the DPM on mode based on whether the input signal is a noise signal, Determine whether to transmit the input signal to the second external device based on whether the input signal is a noise signal; A display device in which the DP interface is activated when the DPM mode of the display device corresponds to the second DPM off mode.

10. In paragraph 9, The at least one processor, by executing the at least one instruction, causes the display device to: A display device that transmits the input signal to the second external device through the communication interface when the input signal is not a noise signal in a state where the DPM mode of the display device corresponds to the DPM on mode.

11. In paragraph 9, The at least one processor, by executing the at least one instruction, causes the display device to: A display device that does not transmit a signal to the second external device when the DPM mode of the display device corresponds to the second DPM off mode and the input signal is not a noise signal.

12. In a method for controlling a display device, A step of changing the DPM mode of the display device to a second DPM off mode when an input signal is received from the first external device while the DPM (Display Power Management) mode of the display device corresponds to the first DPM off mode; A step of identifying whether the above input signal is a noise signal; A step of determining whether to change the DPM mode of the display device from the second DPM off mode to the DPM on mode based on whether the input signal is a noise signal; A control method for a display device in which a display port (DP) interface included in the communication interface of the display device is activated when the DPM mode of the display device corresponds to the second DPM off mode.

13. In paragraph 12, The step of identifying whether the above input signal is a noise signal is: A step of receiving information about the address value of the first external device and the DPM mode of the first external device; and A method for controlling a display device, comprising: a step of identifying whether the input signal is the noise signal based on an address value of the first external device and information about the DPM mode of the first external device.

14. In paragraph 12, The step of determining whether to change the DPM mode of the above display device is a step of maintaining the DPM mode of the display device in a second DPM off mode when the input signal is a noise signal; and A method for controlling a display device, comprising: a step of changing the DPM mode of the display device to the DPM on mode when the input signal is not a noise signal.

15. A non-transitory computer-readable recording medium storing computer instructions that, when executed by at least one processor of a display device, cause the display device to perform an operation, wherein the operation is: A step of changing the DPM (Display Power Management) mode of the display device to a second DPM off mode when an input signal is received from the first external device while the DPM (Display Power Management) mode of the display device corresponds to the first DPM off mode; A step of identifying whether the above input signal is a noise signal; A step of determining whether to switch the DPM mode of the display device from the second DPM off mode to the DPM on mode based on whether the input signal is a noise signal; A computer-readable recording medium in which a display port (DP) interface included in the communication interface of the display device is activated when the DPM mode of the display device corresponds to the second DPM off mode.

Images